Depends on market.
1/.pop the trunk and under the parcel shelf you will find two 1.1/2" square pull handles,or.
2/.on the outer edge of the seats you will have an oblong push button in the top of the seatback.
some markets do not have a rear seat that folds down,check in trunk to see if the seatback is steel or carpet.

1 Suggested Answer

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Related Questions:

Rear Seat Operation Folding the Seatback Your vehicle may have a split folding rear seatback. To fold down the rear seatback on the sedan, do the following: 1. Open the trunk and pull one or both of the gray handles located on the upper part of the trunk opening. The left handle will open the larger side of the seatback. The right handle will open the smaller side of the seatback. 2. Once a handle is pulled, the seatback can be pushed open through the trunk, or pulled open from inside the vehicle3. Fold the seatback down. To raise the seatback, do the following: 1. Push down on one of the levers and pull the seatback up to lock it into place. Make sure the safety belt is not twisted or caught in the seatback. 2. Push and pull the top of the seatback to be sure it is locked into position. 3. Use the reclining front seatback lever to adjust the seatback to a comfortable position.http://cdn.dealereprocess.com/cdn/servicemanuals/chevrolet/2004-malibu.pdf

When you yank on the handle the pawl that engages and locks the seatback into position, so that it won't move, is removed from its receiver. In this mode, the seatback moves freely back and forth as there is nothing to prevent its movement back and forth. You use this movement to find the exact seatback angle for you and when you have, you release the handle and the pawl is reengaged and the seat is locked. (There are various safety features involved that assure you that your seatback will remain locked in position. While the pawl and receiver are quite sturdy, you cannot depend on them alone in a crash. So, there is at least one interlock device that engages when the pawl goes home. The interlock helps to "rigidize" the seatback so it doesn't move.)

What is happening in your car's case, though is this, the interlock may be broken so that even if the pawl releases from the receiver, which it apparently is doing, your seatback remains locked because the linkage between the handle, pawl and the interlock is not working. You will have to have the interlock (it could be that device) and its linkages repaired before the problem will clear up.

Pull the release straps located in the trunk. The right strap operates the passenger's side rear split seat. The left strap operates the driver's side rear split seat. Fold the seatback down from the inside of the vehicle

prizm = toy corolla. so the operators guide is more easy to find. 4 0 million corolla's made, a world record. and means facts on it not rare. page 16 covers this, and has a special switch there, to prevent what you are attempting. per this drawing.

"This system deactivates the lock release lever so that things locked in the trunk can be protected. 1. Push down the security lock levers to lock the rear seatbacks. On vehicles with built-in child restraint, only the left seatback has a lock lever and can be lowered. The right seatback cannot be folded down. After locking the rear seatbacks, try folding them down to make sure they are securely locked, otherwise, someone could get into the trunk by folding down a rear seat."

so if your car has this feature. and is ENABLED> only locksmith can help you. drive there and get it cured. easy no?

now page 16b, with out this feature.

so we cant really answer, as we dont really know which car you have option wise. but i answered you, both ways.

Why not buy the operators guide and not be in a fix NEXT time.yah think?

Sedan: Pull one or both of the unlocking controls in the luggage compartment and fold the rear seatback forward.
Or
3Dr-Hatch: Push the unlocking control on top of the rear seatback and fold the rear seatback forward.

I have an ugly feeling that the adustment for the latch mechanism slipped so that the stationary part is now moving with the mobile part.
I would almost bet that you can lift the trunk lid a little.

Is there no access whatsoever through the floor of the trunk?
On most vehicles there are holes under the mat that allow access to places not accessible from outside.
If your spare is in a horizontal well, then it really isn't likely that you could reach the latch assembly even if you have plugged holes.
You might check your owner's manual to see if your car is equipped with an emergency release for children trapped in the trunk by accident.
If there is, you may be able to reach it by drilling a smaller hole behind the lower seat cushion which should be removable even if the upper one is not.

I confess to being very curious about the potential cure for this problem.
If you solve it, you might post it back for the benefit of others.